HOW TO GET AIR BUBBLE COOLANT NOISE OUT?

Hi there, can some one help me out. I have a 2008 Honda Fit it only has 29000 miles Ive been hearing bubble noise inside my car, I am sure that must be air trapped in the cooling system.I bought new antyfreeze at the honda dealer I flushed the radiator, fill it up again with the new antyfreeze, and the noise stills there.

this will be air in the heater cor, try taking off a heater hose and backfilling the heater core, leave the hose loose and start the engine pull the hose back just a little, enough to bleed out any air, r fit the hose and tighten, do this with the heater on full, run till hot and check for leaks.